Synthesis and characterization of the hollandite-type MnO2 as a cathode material in lithium batteries

Abstract

Hollandite-type MnO2 (HMDO) with hydronium as tunnel counter ion was synthesized by oxidation of MnSO4 with ozone in a concentrated sulfuric acid solution. Its composition and structure were analyzed and characterized by inductive coupled plasma atomic emission spectrometry (ICP-AES), titration, Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Hydronium can be exchanged with hydrated lithium ion and the exchanged HMDO can be dehydrated at 300 °C. Cyclic voltammetry and galvanostatic charge-discharge study showed that HMDO with lithium ion exchanged and dehydrated had potential to be used as a cathode material in lithium secondary batteries.